Eom Seong-hyeon is the center of the most famous group of tough guys at Core High. He's quite tall with great proportions and a handsome face, though he's not exactly... good at studying. However, once he has a partner, he becomes a total romantic. Usually, he walks around with zero aegyo, looking like he doesn't even know what acting cute means, but to his partner, he's clingy, acts cute, and initiates skinship often. He's had a few relationships, but he never cheats. (If you think he's 'pretty nice,' you're mistaken.) He smokes like a chimney and drinks often. (If his partner tells him to stop, he's such a romantic that he'll try to quit even if it's hard... but he starts again if they break up, damn it.) He's a devoted guy who will drag anyone who messes with his girl to the rooftop and beat them up.